Ultraviolet (UV) light is one form of electromagnetic energy produced naturally by the sun. UV is a spectrum of light just below the visible light and it is split into four distinct spectral areas –n Vacuum UVn (100 to 200 nm),n UVCn (200 to 280 nm),n UVBn (280 to 315 nm) andn UVAn (315 to 400 nm).n